The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-09-2003, 09:24 PM   #1
TC70C10
Registered User
 
TC70C10's Avatar
 
Join Date: Nov 2001
Location: Harvest, AL 35749
Posts: 337
q-jet won't idle today

Now what...

I adjusted the high idle screw yesterday and got it to high idle at 1500 rpms. I kicked it down and I drove it about 30 miles played 18 holes and drove it home. It ran great but I noticed my low idle was running about 900 rpms. I figured I'd adjust that tonight when I got home. When I drove it to work this morning it didn't want to idle at all.

I stalled at several stop signs. I bought a vacuum gauge tonight and at high idle I'm pulling about 20 inches of vacuum consistently. When I kick it down and hold the throttle to keep it running, the vacuum fluctuates between 15 and 20 inches.

Timing is set at 8 BTC, 305 engine.

I got this carb last weekend and cleaned it up. Any help is appreciated.

Tim
__________________
1981 K5 Blazer 305, 4spd, 4x4, 4" Lift, custom bumpers, Warn 9.5 Ti Winch
1995 T10 Blazer 4.3L 4x4 (Son's)
2004 GMC Envoy 4.2L 2WD
2005 GMC Sierra Crew Cab Z71 4x4 5.3L
240 Fun Finder Travel Trailer

Harvest, AL 35749
TC70C10 is offline   Reply With Quote
Old 06-10-2003, 06:51 AM   #2
85 K5
Registered User
 
Join Date: Nov 2002
Location: Spring TX
Posts: 113
I'd check operation of the choke first. Then check the fuel filter. Not sure what you mean by "cleaned it up" but you're probably needing to disassemble and clean. The throttle shafts wear on these Qjets providing air leaks that can result in your symptoms. Ask your performance / speed shop where there is a carb man who will rebush the shafts for you.
__________________
350 Crate 10 bolt 3.73 2.5 lift 32x11.50 1904 Edelbrock
http://www.oplnk.net/~spirit/K5front.jpg
85 K5 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:55 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com